[30388f42] Infrastructure Hardening: Repaired CE/Connector DB schema, fixed frontend styling build, implemented robust echo shield in worker v2.1.1, and integrated Lead Engine into gateway.

dockerfiles/Dockerfile.b2b

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+# Stage 1: Build the React frontend
+FROM node:20-slim AS frontend-builder
+
+WORKDIR /app
+
+# Copy package.json and install all dependencies
+# Paths are relative to the build context (project root)
+COPY b2b-marketing-assistant/package.json ./
+RUN npm install
+
+# Copy the rest of the frontend application code
+COPY b2b-marketing-assistant/ .
+
+# Build the application
+RUN npm run build
+
+# ---
+
+# Stage 2: Final application image
+FROM python:3.11-slim
+
+WORKDIR /app
+
+# Install system dependencies (minimal)
+# We use NodeSource to get a clean, modern Node.js install without bloat
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends curl ca-certificates && \
+    curl -fsSL https://deb.nodesource.com/setup_20.x | bash - && \
+    apt-get install -y --no-install-recommends nodejs && \
+    rm -rf /var/lib/apt/lists/*
+
+# Install Python dependencies
+COPY b2b-marketing-assistant/requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy the Node.js server and its production dependencies manifest
+COPY b2b-marketing-assistant/server.cjs .
+COPY b2b-marketing-assistant/package.json .
+
+# Install only production dependencies for the Node.js server
+RUN npm install --omit=dev
+
+# Copy the built React app from the builder stage
+COPY --from=frontend-builder /app/dist ./dist
+
+# Copy the main Python orchestrator script from the project root
+COPY b2b-marketing-assistant/b2b_marketing_orchestrator.py .
+COPY market_db_manager.py .
+
+# Expose the port the Node.js server will run on
+EXPOSE 3002
+
+# The command to run the application
+CMD ["node", "server.cjs"]